1. Member States shall take the necessary steps to ensure that the provisions of occupational social security schemes for self-employed persons contrary to the principle of equal treatment are revised with effect from 1 January 1993 at the latest or for Member States whose accession took place after that date, at the date that Directive 86/378/EEC became applicable in their territory.
2. This Chapter shall not preclude rights and obligations relating to a period of membership of an occupational social security scheme for self-employed persons prior to revision of that scheme from remaining subject to the provisions of the scheme in force during that period.